CN218101494U

CN218101494U - Battery pack

Info

Publication number: CN218101494U
Application number: CN202222376916.XU
Authority: CN
Inventors: 赵冬; 孙倩倩; 沈玉阳
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2022-12-20
Anticipated expiration: 2032-09-07
Also published as: DE202023102332U1

Abstract

The utility model relates to a battery technology field provides a battery pack, include: a plurality of first cells with a gap formed between adjacent first cells; a second battery, at least a portion of the second battery being located within the gap; wherein the size of the first battery is not consistent with the size of the second battery. A gap is formed between the adjacent first batteries, and the size of the first batteries is different from that of the second batteries, so that the second batteries can be arranged in the gap, the gap formed between the first batteries is effectively utilized, the space utilization rate of the battery pack is improved, and the integral volume energy density of the battery pack is improved.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery pack.

Background

In the related art, the battery pack may include a plurality of cells, and due to the limitation of the cell structure or arrangement, the plurality of cells may have a large gap after being arranged, which affects the overall volumetric energy density of the battery pack.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack to improve the performance of battery pack.

The utility model provides a battery pack, include:

a plurality of first cells with gaps formed between adjacent first cells;

a second battery, at least a portion of the second battery being located within the gap;

wherein the size of the first battery is not consistent with the size of the second battery.

The utility model discloses group battery includes a plurality of first batteries and second battery, is formed with the clearance between the adjacent first battery, and the size of first battery is inconsistent with the size of second battery to can set up the second battery in the clearance, effectively utilize the clearance that forms between the first battery with this, thereby improve the space utilization of group battery, with this whole volume energy density of group battery that improves.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a partial structural schematic view of a battery pack according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a partial structure of a battery pack according to an exemplary embodiment;

fig. 3 is a schematic structural view showing a battery pack according to a first exemplary embodiment;

fig. 4 is a schematic structural view showing a battery pack according to a second exemplary embodiment;

fig. 5 is a schematic structural view showing a battery pack according to a third exemplary embodiment.

The reference numerals are explained below:

10. a first battery; 11. a gap; 20. a second battery; 30. a temperature regulating member; 31. a first protrusion; 32. a second protrusion; 40. a first bus bar; 50. a second bus bar; 51. a third bus bar; 60. a battery box body.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, so it should be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery pack, please refer to fig. 1 to 5, the battery pack includes: a plurality of first cells 10 with gaps 11 formed between adjacent first cells 10; a second battery 20, at least a portion of the second battery 20 being located within the gap 11; wherein the size of the first battery 10 does not correspond to the size of the second battery 20.

The utility model discloses the group battery of an embodiment includes a plurality of first batteries 10 and second battery 20, is formed with clearance 11 between the adjacent first battery 10, and the size of first battery 10 is inconsistent with the size of second battery 20 to can set up second battery 20 in clearance 11, with this clearance 11 that effectively utilizes to form between the first battery 10, thereby improve the space utilization of group battery, with this whole volume energy density of improvement group battery.

It should be noted that the size of the first battery 10 is not consistent with the size of the second battery 20, a gap 11 is formed between adjacent first batteries 10, and the second battery 20 can be placed in the gap 11, so that the second battery 20 can fill the gap 11 formed between the first batteries 10, thereby fully utilizing the space of the battery pack and improving the overall volume energy density of the battery pack. As shown in fig. 3, a plurality of first cells 10 have gaps 11 formed therebetween, and second cells 20 are disposed in the gaps 11.

In one embodiment, the cross-sectional area of the first cell 10 is not identical to the cross-sectional area of the second cell 20, that is, the surface area of the first cell 10 in the direction perpendicular to the height thereof is not identical to the surface area of the second cell 20 in the direction perpendicular to the height thereof, so that the second cell 20 can sufficiently utilize the gap 11 formed between the first cells 10, thereby increasing the overall volumetric energy density of the battery pack.

In one embodiment, the height of the first battery 10 is substantially equal to the height of the second battery 20, and on the basis of ensuring that the second battery 20 can fully utilize the gap 11 formed between the first batteries 10, the height and space occupied by the first batteries 10 and the second batteries 20 after being grouped are substantially consistent, so that the space utilization rate of the battery pack can be improved to a certain extent, the problem of space waste is avoided, and the overall volume energy density of the battery pack is ensured.

The cross sectional area of the first battery 10 is inconsistent with the cross sectional area of the second battery 20, so that the second battery 20 can adapt to the gap 11 formed between the first batteries 10, the gap 11 can be reasonably utilized by the second battery 20, the space of the battery pack can be fully utilized, the height of the first battery 10 is basically equal to the height of the second battery 20, the height space of the gap 11 can be reliably utilized by the second battery 20, the overall volume energy density of the battery pack can be ensured, no vacant space is formed inside the battery pack, and the stability between the batteries can be ensured to a certain extent.

It should be noted that the cross section of the first cell 10 may be considered as a section formed in a direction perpendicular to the height direction of the first cell 10, and the cross section of the second cell 20 may be considered as a section formed in a direction perpendicular to the height direction of the second cell 20, and the height of the first cell 10 may be equal to the height of the second cell 20 regardless of the manufacturing error and the mounting error of the first cell 10 and the second cell 20.

The cross-sectional area of the first cell 10 may be a surface area in a direction perpendicular to the height of the first cell 10, and the cross-sectional area of the second cell 20 may be a surface area in a direction perpendicular to the height of the second cell 20. The height direction of the first cell 10 is parallel to the height direction of the second cell 20, and the height direction of the first cell 10 and the height direction of the second cell 20 are parallel to the height direction of the gap 11, where the height direction of the first cell 10 and the height direction of the second cell 20 are defined with reference to the height direction of the gap 11.

In some embodiments, it is not excluded that the height of the first battery 10 may not be equal to the height of the second battery 20. The cross-section of the first cell 10 may be equal to the cross-section of the second cell 20.

In one embodiment, the size of the first battery 10 is larger than the size of the second battery 20; the cross-sectional area of the first battery 10 is greater than that of the second battery 20, that is, the surface area of the first battery 10 along the direction perpendicular to the height direction thereof may be greater than that of the second battery 20 along the direction perpendicular to the height direction thereof, so that the second battery 20 can be adapted to the gap 11 formed between the first batteries 10, thereby making full use of the internal space of the battery pack, thereby improving the space utilization rate of the battery pack and ensuring the energy density of the whole volume of the battery pack.

Gaps 11 can be formed among the first batteries 10 with larger sizes, and the second batteries 20 with smaller sizes can be effectively filled in the gaps 11, so that the overall volume energy density of the battery pack is improved.

In one embodiment, the number of the second batteries 20 is multiple, and the multiple second batteries 20 may be disposed in the multiple gaps 11, so as to fully utilize the gaps 11 formed between the first batteries 10, thereby improving the space utilization rate of the battery pack, and thus improving the overall volumetric energy density of the battery pack.

A gap 11 may be formed between adjacent first batteries 10, a gap 11 may be formed between two first batteries 10, and one or two gaps 11 may be formed between two first batteries 10. Alternatively, one gap 11 may be formed between three first cells 10. Or, a gap 11 may be formed between four first batteries 10, which is not limited herein, and a plurality of first batteries 10 may form a structure of multiple rows and multiple columns, so as to form a plurality of gaps 11, thereby placing a plurality of second batteries 20, thereby improving the space utilization rate of the battery pack and increasing the overall volumetric energy density of the battery pack.

In one embodiment, a plurality of first cells 10 are electrically connected to form a first cell assembly, and a plurality of second cells 20 are electrically connected to form a second cell assembly. The plurality of first batteries 10 may be connected in series or in parallel, and the plurality of second batteries 20 may be connected in series or in parallel, thereby enabling the first batteries 10 and the second batteries 20 to be used as energy storage structures for supplying power to external devices, for example, the first batteries 10 and the second batteries 20 can be used for supplying power to a vehicle.

In one embodiment, the first battery pack and the second battery pack are electrically connected, thereby enabling the first battery pack and the second battery pack as one charging and discharging body for supplying power to an external device, for example, the first battery 10 and the second battery 20 collectively supply power to the vehicle, thereby being used for the operation of the vehicle.

In one embodiment, the capacity of the first battery 10 is greater than the capacity of the second battery 20; wherein, a plurality of second batteries 20 are connected in parallel, and the first battery pack and the second battery pack are connected in series, or, a plurality of second batteries 20 are connected in series, and the first battery pack and the second battery pack are connected in parallel. The first battery pack and the second battery pack can be connected in series or in parallel according to actual requirements, so that the use requirement of the battery pack is met, and the safety performance of the battery pack can be ensured.

It should be noted that the series connection of the batteries needs to satisfy the requirement of consistent capacity, that is, the battery currents are consistent, so as to avoid safety risks such as the first battery 10 is not fully charged after the second battery 20 is fully charged due to inconsistent capacity, or lithium precipitation of the battery due to overcharge of the second battery 20 when the first battery 10 is fully charged. The parallel connection of batteries needs to guarantee that the voltages between the batteries are consistent, the inconsistent voltages can lead to the fact that the batteries are not fully charged, and the service life of the whole batteries is influenced.

In one embodiment, the first battery assembly and the second battery assembly are independently arranged to prevent the first battery assembly and the second battery assembly from being electrically connected, that is, the first battery assembly and the second battery assembly can be independently used for supplying power, for example, the first battery assembly can be used for running of a vehicle, the first battery assembly can drive a running system of the vehicle, and the second battery assembly can provide power for structures such as a lamp control system or a liquid cooling system of the vehicle.

The plurality of first batteries 10 may be connected to supply power to the vehicle to drive the vehicle to travel, and the plurality of second batteries 20 may be connected to supply power to auxiliary structures of the vehicle, for example, the plurality of second batteries 20 may supply power to a lamp control system of the vehicle, and may independently charge the first battery pack and the second battery pack when charging the battery pack.

In one embodiment, the charge cutoff voltage of the first battery 10 is lower than the charge cutoff voltage of the second battery 20, so that the voltage at which the first battery 10 reaches the fully charged state can be made smaller than the voltage at which the second battery 20 reaches the fully charged state.

The size of the first battery 10 may be larger than that of the second battery 20, and the first battery 10 and the second battery 20 may be of the same system, or the first battery 10 and the second battery 20 may be of different systems, and the first battery 10 may be a ferro lithium battery and the second battery 20 may be a ternary battery. Alternatively, the first battery 10 may be a low nickel battery, and the second battery 20 may be a high nickel battery. Alternatively, the first battery 10 may be a lithium ion battery and the second battery 20 may be a sodium ion battery. Alternatively, the system of the first battery 10 and the second battery 20 may be the opposite example described above. The safety performance of the second battery 20 is improved, and meanwhile, the battery pack capacity is improved, and the acquisition precision of the battery pack can also be improved.

In some embodiments, the charge cutoff voltage of the first battery 10 may be equal to the charge cutoff voltage of the second battery 20. Alternatively, the charge cutoff voltage of the first battery 10 may be greater than the charge cutoff voltage of the second battery 20.

In one embodiment, the first battery 10 is a cylindrical battery or a prismatic battery. The second battery 20 is a cylindrical battery or a prismatic battery. The structural forms of the first and

second batteries

10 and 20 may be identical, or the structural forms of the first and

second batteries

10 and 20 may not be identical.

As shown in fig. 1 to 3, the first battery 10 may be a first cylindrical battery, the second battery 20 may be a second cylindrical battery, the diameter of the first cylindrical battery is greater than that of the second cylindrical battery, and the second cylindrical battery may be disposed between four adjacent first cylindrical batteries.

As shown in fig. 4, the first battery 10 may be a cylindrical battery, the second battery 20 may be a triangular prism battery, the triangular prism battery may be disposed between three cylindrical batteries, three sides of the triangular prism battery may be straight lines, or three sides of the triangular prism battery may be curved, and the emphasis is placed on illustrating the general shape of the second battery 20.

As shown in connection with fig. 5, the first battery 10 may be a quadrangular prism battery, and the second battery 20 may be a triangular prism battery, and two triangular prism batteries may be disposed therebetween.

In one embodiment, the battery pack further includes a temperature-adjusting member 30, and the temperature-adjusting member 30 is in contact with both the first battery 10 and the second battery 20, so that the temperature-adjusting member 30 can simultaneously perform temperature adjustment of the first battery 10 and the second battery 20.

The temperature adjusting member 30 may be used for heating of the first and

second batteries

10 and 20, or the temperature adjusting member 30 may be used for cooling of the first and

second batteries

10 and 20. The temperature adjustment member 30 may be an air-cooled structure, or the temperature adjustment member 30 may be a liquid-cooled structure, or the temperature adjustment member 30 may be an electric heating structure, or the like.

In one embodiment, the temperature-adjusting member 30 may be in contact with end surfaces of the first and

second batteries

10 and 20, for example, the temperature-adjusting member 30 may be disposed at a bottom surface of a battery case such that the temperature-adjusting member 30 is in contact with bottom ends of the first and

second batteries

10 and 20. Alternatively, the temperature-adjusting member 30 may be provided on the top surface of the battery case such that the temperature-adjusting member 30 is in contact with the top ends of the first and

second batteries

10 and 20.

In one embodiment, as shown in fig. 1, the temperature adjusting member 30 is simultaneously in contact with the sidewalls of the first and

second batteries

10 and 20, thereby achieving rapid heating or cooling of the first and

second batteries

10 and 20, thereby improving the safety of the battery pack.

It should be noted that the temperature adjustment member 30 may be disposed perpendicular to the bottom surface of the battery pack, i.e., the temperature adjustment member 30 may be located at the side surface of the battery pack, thereby forming efficient and stable adjustment of the first battery 10 and the second battery 20.

When the battery pack is a battery module, the bottom surface of the battery pack may be considered as a bottom surface formed by the respective batteries of the battery module. When the battery pack is a battery pack, the bottom surface of the battery pack can be regarded as the bottom surface of the battery box body.

In one embodiment, as shown in fig. 1, the temperature adjusting member 30 includes a plurality of first protrusions 31 and at least one second protrusion 32, the first protrusions 31 and the second protrusions 32 are in contact with the side walls of the first battery 10 and the second battery 20, respectively, to thereby achieve rapid heating or cooling of the first battery 10 and the second battery 20, and the side walls of the first battery 10 and the second battery 20 generate relatively much heat, so that rapid heat dissipation of the first battery 10 and the second battery 20 can be achieved by bringing the first protrusions 31 and the second protrusions 32 of the temperature adjusting member 30 into contact with the side walls of the first battery 10 and the second battery 20, respectively, to thereby improve the safety use performance of the battery pack.

The temperature adjusting member 30 may be a serpentine pipe to form a plurality of first protrusions 31 and at least one second protrusion 32 to maximally contact the sidewalls of the first and

second batteries

10 and 20, thereby improving the heat exchange capability of the first and

second batteries

10 and 20.

It should be noted that the temperature adjustment member 30 may be directly in contact with the first battery 10 and the second battery 20. Alternatively, a heat conduction portion may be disposed between the temperature adjustment member 30 and the first and

second batteries

10 and 20, and the heat conduction portion may be a heat conduction material in the related art, for example, the heat conduction portion may include a graphene sheet, a heat conduction silicone grease, and the like, which is not limited herein. The heat conduction portion may also be a heat conduction adhesive, and further, the heat conduction portion may be a heat conduction structural adhesive, which may not only be used for heat transfer, but also may realize reliable connection of the temperature adjustment member 30 with the first battery 10 and the second battery 20.

The first and

second batteries

10 and 20, which are collectively referred to as a battery, include a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first and second electrodes may be interchanged.

The battery is the lamination formula battery, and it is convenient not only to organize, and can process and obtain the longer battery of length. Specifically, the electric core is the lamination formula electric core, and the electric core has first pole piece that range upon range of each other, with first pole piece opposite second pole piece of electric property and the diaphragm piece of setting between first pole piece and second pole piece to make and pile up formation lamination formula electric core to many pairs of first pole piece and second pole piece.

Optionally, the battery may be a winding battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm piece disposed between the first pole piece and the second pole piece are wound to obtain a winding battery cell.

The battery pack is a battery module or a battery pack.

In one embodiment, the first battery 10 may be a quadrangular prism battery, and the battery module may further include end plates and side plates for fixing the plurality of batteries.

It should be noted that a plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed through the end plate and the side plate. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

In one embodiment, the first battery 10 may be a first cylindrical battery, the second battery 20 may be a second cylindrical battery, and the battery module may further include a bracket to which the batteries may be fixed.

It should be noted that the battery pack includes a plurality of batteries, and the plurality of batteries are disposed in the box body. Wherein, a plurality of batteries can form and install in the battery box behind the battery module. Or, a plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, utilizes the battery box to fix a plurality of batteries.

As shown in fig. 1, the battery pack includes a battery case 60, a plurality of first batteries 10 and a plurality of second batteries 20 disposed in the battery case 60, and a temperature adjusting member 30 may be disposed in the battery case 60.

As shown in fig. 1 and 2, a plurality of first batteries 10 may be connected by a first bus bar 40, and a plurality of second batteries 20 may be connected by a second bus bar 50, and the first bus bar 40 and the second bus bar 50 may be connected.

As shown in fig. 2, the first busbar 40 and the second busbar 50 may be connected by a third busbar 51.

It should be noted that multiple sets of the first battery 10 and the second battery 20 may be disposed in the battery box 60, so as to adapt to the energy requirement of the battery pack. A plurality of subspaces may be formed in the battery case 60, and one or more sets of the first and

second batteries

10 and 20 may be disposed in each of the subspaces.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the disclosure is limited only by the appended claims.

Claims

1. A battery pack, comprising:

a plurality of first cells (10) with gaps (11) formed between adjacent first cells (10);

a second battery (20), at least part of said second battery (20) being located within said gap (11);

wherein the size of the first battery (10) does not correspond to the size of the second battery (20).

2. The battery according to claim 1, characterized in that the size of said first battery (10) is greater than the size of said second battery (20);

wherein the surface area of the first cell (10) in a direction perpendicular to its height is larger than the surface area of the second cell (20) in a direction perpendicular to its height.

3. The battery pack according to claim 1, wherein the second battery (20) is plural.

4. A battery pack according to claim 3, wherein a plurality of said first cells (10) are electrically connected to form a first cell assembly and a plurality of said second cells (20) are electrically connected to form a second cell assembly.

5. The battery pack of claim 4, wherein the first battery assembly and the second battery assembly are electrically connected.

6. The battery pack according to claim 5, characterized in that the capacity of the first battery (10) is larger than the capacity of the second battery (20);

wherein the plurality of second batteries (20) are connected in parallel and the first battery assembly and the second battery assembly are connected in series, or the plurality of second batteries (20) are connected in series and the first battery assembly and the second battery assembly are connected in parallel.

7. The battery pack of claim 4, wherein the first battery assembly and the second battery assembly are independently arranged to avoid electrical connection of the first battery assembly and the second battery assembly.

8. The battery pack according to claim 1, characterized in that the charge cut-off voltage of the first battery (10) is lower than the charge cut-off voltage of the second battery (20).

9. The battery according to any one of claims 1 to 8, characterized in that the first battery (10) is a cylindrical battery or a prismatic battery.

10. The battery according to any one of claims 1 to 8, characterized in that the second battery (20) is a cylindrical battery or a prismatic battery.

11. The battery according to any one of claims 1 to 8, characterized in that the battery further comprises a temperature regulating member (30), the temperature regulating member (30) being in contact with the first battery (10) and the second battery (20) simultaneously.

12. The battery pack according to claim 11, wherein the temperature-adjusting member (30) is disposed perpendicular to a bottom surface of the battery pack.

13. The battery pack according to claim 12, wherein the temperature regulating member (30) comprises a plurality of first protrusions (31) and at least one second protrusion (32), the first protrusions (31) and the second protrusions (32) being in contact with side walls of the first battery (10) and the second battery (20), respectively.

14. The battery according to any one of claims 1 to 8, characterized in that the surface area of the first cell (10) perpendicular to its height direction does not coincide with the surface area of the second cell (20) perpendicular to its height direction, the height of the first cell (10) being substantially equal to the height of the second cell (20).